package net.gnehzr.cct.misc;

import javax.swing.*;
import java.beans.*;
import java.awt.*;
import java.io.File;

/* ImagePreview.java is a 1.4 example used by FileChooserDemo2.java. */
public class ImagePreview extends JComponent implements PropertyChangeListener {
	ImageIcon thumbnail = null;
	File file = null;

	public ImagePreview(JFileChooser fc) {
		setPreferredSize(new Dimension(100, 50));
		fc.addPropertyChangeListener(this);
	}

	public void loadImage() {
		if(file == null) {
			thumbnail = null;
			return;
		}

		//Don't use createImageIcon (which is a wrapper for getResource)
		//because the image we're trying to load is probably not one
		//of this program's own resources.
		ImageIcon tmpIcon = new ImageIcon(file.getPath());
		if(tmpIcon.getIconWidth() > 90) {
			thumbnail = new ImageIcon(tmpIcon.getImage().
					getScaledInstance(90, -1,
							Image.SCALE_DEFAULT));
		} else { //no need to miniaturize
			thumbnail = tmpIcon;
		}
	}

	public void propertyChange(PropertyChangeEvent e) {
		boolean update = false;
		String prop = e.getPropertyName();

		//If the directory changed, don't show an image.
		if(JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(prop)) {
			file = null;
			update = true;

			//If a file became selected, find out which one.
		} else if(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(prop)) {
			file = (File) e.getNewValue();
			update = true;
		}

		//Update the preview accordingly.
		if(update) {
			thumbnail = null;
			if (isShowing()) {
				loadImage();
				repaint();
			}
		}
	}

	protected void paintComponent(Graphics g) {
		if(thumbnail == null) {
			loadImage();
		}
		if(thumbnail != null) {
			int x = getWidth()/2 - thumbnail.getIconWidth()/2;
			int y = getHeight()/2 - thumbnail.getIconHeight()/2;

			if(y < 0)
				y = 0;
			if(x < 5)
				x = 5;
			thumbnail.paintIcon(this, g, x, y);
		}
	}
}
